Ball valve



FIG. 1 is a top perspective view of a ball valve showing my new design;

FIG. 2 is a bottom view of the ball valve of FIG. 1;

FIG. 3 is a front view of the ball valve of FIG. 1;

FIG. 4 is a top view of the ball valve of FIG. 1;

FIG. 5 is a rear view of the ball valve of FIG. 1;

FIG. 6 is a left view of the ball valve of FIG. 1; and,

FIG. 7 is a right view of the ball valve of FIG. 1. 

The ornamental design for a ball valve, as shown and described. 